<!DOCTYPE html>
<html>
<head>
	<title></title>
	<style type="text/css">
	/*div{
		background: blue!important;
	}*/
	/*#box{
		background: orange;
	}*/
	
	ul li.lis1{
		background: blue;
	}
	
	.lis1{
		background: red;
	}
	</style>
</head>
<body>

<!-- <div style='background: red;' id='box'>1111</div> -->

<ul>
	<li class='lis1 lis2 lis3 lis4'>11</li>
	<li>22</li>
	<li>33</li>
	<li>44</li>
	<li>55</li>
</ul>

</body>
</html>